Question

21. If a train runs at 40 km/h, it reaches its destination
late by 11 min. But, if it runs at 50 km/h, it is late
by 5 min only. The correct time for the train to
complete its journey is
(a) 15 min
(b) 21 min
(c) 13 min
(d) 19 min

Answer 1

Answer:

19 min

Let the correct time for the train to complete the journey is x minuets

Then train cover distance in x+11 minuets at speed 40 km\hr =

60

40(x+11)

km

Then train cover distance in x+5 minuets at speed 50 km\hr =

60

50(x+5)

km

Both are same then

60

40(x+11)

=

60

50(x+5)

∴40x+440=50x+250

∴−10x=−190

∴x=19 minutes

Answer 2

Step-by-step explanation:

If a train runs at 40 Km/hr, it reaches its destination late by 11 minutes, but if it runs at 50 km/hr, it is late by 5 minutes only. The correct time for the train to complete its journey is. A) 13 min.